Question

Which phase change at standard temperature and pressure represents sublimation? [ASSET]

(a) CO2 (s)  CO2 (g)
(b) H2O (l)  H2O (g)
(c) CO2 (l)  CO2 (g)
(d) H2O (s)  H2O (l)

Answer 1

(a) CO₂(s) ⇌ CO₂(g) is an example of sublimation.

Sublimation is the conversion of a solid directly to a gas without going through the liquid phase.